CN108595807B - A kind of calculation method of roadway floor release groove width - Google Patents
A kind of calculation method of roadway floor release groove width Download PDFInfo
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- CN108595807B CN108595807B CN201810334759.1A CN201810334759A CN108595807B CN 108595807 B CN108595807 B CN 108595807B CN 201810334759 A CN201810334759 A CN 201810334759A CN 108595807 B CN108595807 B CN 108595807B
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- 238000004364 calculation method Methods 0.000 title claims abstract description 18
- 239000011435 rock Substances 0.000 claims abstract description 35
- 238000005259 measurement Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 15
- 239000003245 coal Substances 0.000 description 11
- 210000002421 cell wall Anatomy 0.000 description 5
- 239000003292 glue Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 3
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- 238000002474 experimental method Methods 0.000 description 3
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- 210000003969 blast cell Anatomy 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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Abstract
The invention discloses a kind of calculation methods of roadway floor release groove width for this, comprising the following steps: Step 1: determining the depth value h of pressure relief groove；Step 2: calculating horizontal uniform load p；Step 3: determining the elastic modulus E of rock stratum in pressure relief groove depth bounds；Step 4: determining that release groove width l, release groove width l should meet formula:In the formula: k is redundancy, l is release groove width, υ is the Poisson's ratio of tunnel overlying rock, γ is the volume-weighted average of tunnel overlying rock, H is tunnel buried depth, h is release groove depth, the elasticity modulus that E is rock stratum in pressure relief groove depth bounds.Calculation method of the present invention is simple, enables to the selection of release groove width no longer blindly, it is ensured that pressure relief groove administers the science and reasonability of Floor Heave in Roadway, practical.
Description
Technical field
The invention belongs to coal mining technology fields, are specifically related to a kind of calculating side of roadway floor release groove width
Method.
Background technique
After tunnel excavates, floor strata can buckle under stress into tunnel, dilatation, expansion, form pucking.Pucking
The common dynamic phenomenon of coal mine roadway, field measurement statistics indicate that, in the roof to floor convergence of China's coal-mine tunnel about 2/3 be by
Bottom plate heave deformation caused by, pucking causes drift section to deform, and hinders ventilation, interferes normal transport and pedestrian.Administer bottom
Bulging expense accounts for more than half of entire roadway maintenance total cost, and pucking causes to seriously affect to the production of mine.How to control
Reason Floor Heave in Roadway becomes the main bugbear that many coal mines face.
Summarize domestic and international various pucking control technologies at present, type can be divided into three categories according to the difference of control mechanism, it may be assumed that branch
Protect method for strengthening, destressing method and combined supporting method.
It is one of destressing method that pressure relief groove, which controls Floor Heave in Roadway method, and mechanism is by opening up release to roadway floor 2
Slot 6 makes bottom plate form " strong and weak strong " so that the high stress for acting on roadway floor 2 originally is transferred to the harder rock stratum in deep
Stablize force structure, mitigate or offset deflection of the roadway floor 2 into 1 space of tunnel with the deflection of pressure relief groove 6, keeps
The stabilization of roadway floor 2, as shown in Figure 2.
When roadway floor 2 is taken open up pressure relief groove 6 handle when, the selection of 6 parameter of pressure relief groove (depth and width) is always
It is the heat subject of current research.Parameter selection is excessive, wastes a large amount of human and material resources and financial resources, and parameter selection is too small, cannot
Effectively administer Floor Heave in Roadway.In the selection to 6 depth of pressure relief groove, more mature theory has been formed at present.It is wide in pressure relief groove 6
In the determination of degree, since previous scholars only lay particular emphasis on research 6 depth of pressure relief groove to the regulation effect of pucking, and ignore to unloading
6 width of indent determines the research of method, causes the selection of current 6 width of pressure relief groove that can only rely on field experience, this unloading
There is very big blindness in the selection of 6 width of indent.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art described above, a kind of roadway floor release groove width is provided
Calculation method studies the determination method of release groove width according to existing theory of mechanics and mine pressure theory,
It proposes the pressure relief groove width calculation method of science, provides the theoretical foundation of science for the selection of release groove width；By experiment and
Actual measurement obtains master data, is then reasonably calculated, the final reasonable value for obtaining release groove width, calculation method letter
It is single；So that the selection of release groove width is no longer blindly, it is ensured that pressure relief groove administers the science and reasonability of Floor Heave in Roadway, practical
Property is strong.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of calculating side of roadway floor release groove width
Method, which comprises the following steps:
Step 1: determining the depth value h of pressure relief groove；
Step 2: calculating the horizontal uniform load p of roadway floor；
Step 3: determining the elastic modulus E of rock stratum in pressure relief groove depth bounds；
Step 4: determining that release groove width l, release groove width l should meet following formula:
In the formula: k is redundancy, l is release groove width, υ is the Poisson's ratio of tunnel overlying rock, γ is on tunnel
Volume-weighted average, the H of rock stratum are tunnel buried depth, h is release groove depth, the elasticity modulus that E is rock stratum in pressure relief groove depth bounds.
A kind of calculation method of above-mentioned roadway floor release groove width, it is characterised in that: calculating described in step 2
The horizontal uniform load p of roadway floor is carried out in accordance with the following steps:
The first step obtains tunnel buried depth value H by measurement or calculating, measures being averaged for tunnel overlying rock by experiment
The Poisson's ratio υ of bulk density γ and tunnel overlying rock,
Second step passes through one p=σ of formulax=(H × 10 λ γ3) h and formula twoTunnel bottom is calculated and determined
The horizontal uniform load p of plate,
In formula one, p is the horizontal uniform load of roadway floor, σxIt is lane for horizontal stress, the γ inside roadway floor
Volume-weighted average, the H of road overlying rock are tunnel buried depth, h is release groove depth, λ is to survey pressure coefficient；
In formula two, λ is to survey pressure coefficient, the Poisson's ratio that υ is tunnel overlying rock.
A kind of calculation method of above-mentioned roadway floor release groove width, it is characterised in that: pressure relief groove described in step 3
The elastic modulus E of rock stratum is to be measured by rock mechanics in situ or laboratory obtains rock sample test in depth bounds
's.
The calculation method of above-mentioned a kind of roadway floor release groove width, it is characterised in that: have more than needed system described in step 3
The value of number k is 1.2~1.6.
The calculation method of above-mentioned a kind of roadway floor release groove width, it is characterised in that: have more than needed system described in step 3
The value of number k is 1.4.
Compared with the prior art, the present invention has the following advantages:
1, the present invention obtains master data by experiment and actual measurement, is then reasonably calculated, finally obtains pressure relief groove
The exact value of reasonable wide；So that the selection of release groove width is no longer blindly, it is ensured that the science of pressure relief groove improvement Floor Heave in Roadway
Property.
2, the present invention grinds the determination method of release groove width according to existing theory of mechanics and mine pressure theory
Study carefully, propose that the pressure relief groove width of science calculates formula method, provides the theoretical foundation of science for the selection of release groove width.
3, the pressure relief groove parameter that the present invention is determined by calculation can effectively prevent the generation of Floor Heave in Roadway, reduce
Roadway maintenance expense solves the problem of construction delay due to caused by pucking, working face can not normally join, and has reached peace
Entirely, efficiently, low consumption, low cost, high benefit production purpose.
4, calculation method of the present invention is simple, practical.
Below by drawings and examples, the present invention is described in further detail.
Detailed description of the invention
Fig. 1 forms the mechanical model figure of pucking for no pressure relief groove tunnel.
Fig. 2 is the structural schematic diagram for the bottom plate " strong and weak strong " that existing pressure relief groove controls in Floor Heave in Roadway method.
Fig. 3 is the model schematic that unloading blast cell wall is reduced to cantilever beam by the present invention.
Fig. 4 is the left side cell wall stress model schematic diagram of pressure relief groove of the present invention.
Description of symbols:
1-tunnel；2-roadway floors；3-floor stratas；
4-stress；5-cell walls；6-pressure relief grooves.
Specific embodiment
Below with reference to peace mountain coal mine 31Four panel glue of coal transport main entry roadway floor pressure relief groove construction to the content of present invention into
Row further illustrates.
Pacify mountain coal mine 31It is 4.7m, a height of 2.5m that four panel glue of coal, which transports big lanewidth,.Directly top is alternating layers medium sandstone, thickness
For 7.26m.Direct bottom is argillaceous siltstoue, and thickness is about 8.17m.Top plate is bolting with wire mesh, and side portion's not supporting, bottom plate is using mixed
Solidifying soil hardening.Roofbolt indulges muscle twisted steel anchor rod using the left-handed nothing of 20 × 2000mm of Φ, between roofbolt array pitch be 1050 ×
1000mm, steel joist length are 4700mm, width 80mm, array pitch 1000mm, and anchor cable hole depth is that tri- figured cloth of 5800mm is set,
Array pitch is 2000 × 3000mm.In main entry tunneling process, floor strata 3 can buckle into tunnel 1 under the action of stress 4, expand
Hold, expansion, forms pucking, as shown in Figure 1.Make tunnel can not normal use, constrain mine and normally connect.Comprehensive analysis,
Determine that digging pressure relief groove in glue fortune main entry bottom plate administers Floor Heave in Roadway.
Step 1: determining the depth value h of pressure relief groove；It is obtained by existing theoretical calculation method combination numerical simulation software
Cutting groove depth h is 2m.
Step 2: calculating the horizontal uniform load p of roadway floor；
The first step, according to the mine geologic information, to obtain tunnel buried depth value H be 131m by measuring or calculate, on tunnel
The volume-weighted average γ of rock stratum is 30KN/m3, the Poisson's ratio υ of tunnel overlying rock is 0.4.
Second step passes through formula p=σx=(H × 10 λ γ3) h (formula one)
And formula
Calculate and obtain the horizontal uniform load p of roadway floor, wherein σxIt is for horizontal stress, the λ inside roadway floor
Survey pressure coefficient；
Step 3: determining the elastic modulus E of rock stratum in pressure relief groove depth bounds；According to the mine geologic information, pass through original position
The roadway floor elastic modulus E that rock mechanics measurement or laboratory obtain rock sample test is 304MPa.
Step 4: determine release groove width l,
As shown in figure 3, if the vertical stress within the scope of 2 grooving of roadway floor is released, cell wall 5 after cutting pressure relief groove 6
Mainly by the effect of the horizontal load P of roadway floor.Therefore, it is h, cross-sectional width b that release cell wall 5 can be reduced to length
The cantilever beam structure of (h/b >=5).It is analyzed by taking 6 left side cell wall 5 of pressure relief groove as an example, the 5 stress mould of left side cell wall of pressure relief groove 6
Type is as shown in Figure 4.
Under the action of the horizontal uniform load p of roadway floor, the equations of rotating angle and deflection curve equation of cantilever beam are as follows:
In formula, E be rock stratum in pressure relief groove depth bounds elasticity modulus, w be cantilever beam generate amount of deflection, θ be left side groove
Corner, the p that wall is formed under the action of the horizontal uniform load p of roadway floor are the horizontal uniform load of roadway floor, z z
The value (z=h in the present embodiment) at any point, h are release groove depth in axis direction, I is rock mass in pressure relief groove depth bounds
Cross sectional moment of inertia,
At this point, generating maximum defluxion w at cantilever beam end Z=hmax:
For that can not continue to absorb bottom deformation after prevention and treatment grooving closure, it is wide to obtain grooving by symmetry at left and right sides of pressure relief groove
Degree l should meet:
By p=σx=(H × 10 λ γ3) h,Hb >=5,Substitution formula (4) obtains notch width l:
By the depth value h of the pressure relief groove determined in step 1；Overlying strata on the tunnel buried depth value H that is obtained in step 2, tunnel
Layer volume-weighted average γ, tunnel overlying rock Poisson's ratio υ；The elasticity of rock stratum in the pressure relief groove depth bounds obtained in step 3
Modulus E；The value for finally bringing redundancy k into again, finally obtains notch width l.
In peace mountain coal mine 31Four panel glue of coal is transported in main entry, h=2m, H=131m, γ=30KN/m3, υ=0.4, E=
304MPa, k=1.2~1.6, preferred k are 1.4.Above data is substituted into formula (5), obtains notch width l=0.4m.
The parameter of V-notched being calculated is used to pacify mountain coal mine 31Four panel glue of coal is transported in main entry pucking governance process, according to
Field measurement data are not cut pressure relief groove tunnel and are deformed in 0 day~80 days acutely；In 80 days~100 days, deformation tends towards stability；
Deformation tends towards stability after 100 days；Average pucking amount 416mm.It cuts pressure relief groove section tunnel and smaller change occurs in 0 day~60 days
Shape；In 60~80 days, deformation tends towards stability；After 80 days, deformation tends towards stability；Average pucking amount 127mm.Cut pressure relief groove section lane
Pressure relief groove Floor Heave in Roadway amount is not cut in road, which, reduces by 69.4%, and the roadway deformation time shortens about 20 days.Bottom plate table after cutting pressure relief groove
Face is smooth, and pucking phenomenon does not occur.
By present invention determine that pressure relief groove parameter effectively prevent the generation of Floor Heave in Roadway, reduce roadway maintenance expense
With solving the problem of construction delay due to caused by pucking, working face can not normally join, reached safe and efficient, low
Consumption, low cost, the purpose of high benefit production.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification, change and equivalent structure transformation to the above embodiments, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (4)
1. a kind of calculation method of roadway floor release groove width, which comprises the following steps:
Step 1: determining the depth value h of pressure relief groove；
Step 2: calculating the horizontal uniform load p of roadway floor；
Step 3: determining the elastic modulus E of rock stratum in pressure relief groove depth bounds；
Step 4: determining that release groove width l, release groove width l should meet following formula:
In the formula: k is redundancy, l is release groove width, υ is the Poisson's ratio of tunnel overlying rock, γ is overlying strata on tunnel
Volume-weighted average, the H of layer are tunnel buried depth, h is release groove depth, the elasticity modulus that E is rock stratum in pressure relief groove depth bounds；
The value of the redundancy k is 1.2~1.6.
2. a kind of calculation method of roadway floor release groove width described in accordance with the claim 1, it is characterised in that: in step 2
The horizontal uniform load p of the calculating roadway floor is carried out in accordance with the following steps:
The first step obtains tunnel buried depth value H by measurement or calculating, and the volume-weighted average of tunnel overlying rock is measured by testing
The Poisson's ratio υ of γ and tunnel overlying rock,
Second step passes through one p=σ of formulax=(H × 10 λ γ3) h and formula twoRoadway floor is calculated and determined
Horizontal uniform load p,
In formula one, p is the horizontal uniform load of roadway floor, σxIt is to be covered on tunnel for horizontal stress, the γ inside roadway floor
Volume-weighted average, the H of rock stratum are tunnel buried depth, h is release groove depth, λ is to survey pressure coefficient；
In formula two, λ is to survey pressure coefficient, the Poisson's ratio that υ is tunnel overlying rock.
3. a kind of calculation method of roadway floor release groove width described in accordance with the claim 1, it is characterised in that: in step 3
The elastic modulus E of rock stratum is to be measured by rock mechanics in situ or laboratory is to rock sample in the pressure relief groove depth bounds
It tests to obtain.
4. a kind of calculation method of roadway floor release groove width described in accordance with the claim 1, it is characterised in that: in step 3
The value of the redundancy k is 1.4.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013046200A1 (en) * | 2011-09-27 | 2013-04-04 | Mobius Protection Systems Ltd. | Safety seat |
| CN205025479U (en) * | 2015-09-17 | 2016-02-10 | 安徽理工大学 | Administer bottom plate support system of soft rock tunnel pucking |
| CN106401609A (en) * | 2016-11-10 | 2017-02-15 | 河南理工大学 | Bottom plate pressure relief and reinforcement structure for controlling floor heave of deep roadway and construction method of bottom plate pressure relief and reinforcement structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203756206U (en) * | 2014-03-19 | 2014-08-06 | 山东科技大学 | Novel soft-rock roadway floor heave governing structure |
| CN206205903U (en) * | 2016-11-10 | 2017-05-31 | 河南理工大学 | A kind of base plate release ruggedized construction of control deep tunnel bottom distension |
| CN107246273B (en) * | 2017-07-30 | 2023-02-24 | 河南理工大学 | Deep roadway steel wire rope net rubber sprayed concrete supporting structure and construction method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013046200A1 (en) * | 2011-09-27 | 2013-04-04 | Mobius Protection Systems Ltd. | Safety seat |
| CN205025479U (en) * | 2015-09-17 | 2016-02-10 | 安徽理工大学 | Administer bottom plate support system of soft rock tunnel pucking |
| CN106401609A (en) * | 2016-11-10 | 2017-02-15 | 河南理工大学 | Bottom plate pressure relief and reinforcement structure for controlling floor heave of deep roadway and construction method of bottom plate pressure relief and reinforcement structure |
Non-Patent Citations (1)
| Title |
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| "卸压槽卸压法在控制两帮变形中的应用";周单玉;《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》;20170815;第20-25页 |
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